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New step down DC/DC controllers

Linear Technology Corporation has introduced the LTC3878 and LTC3879 high efficiency synchronous step down DC/DC controllers.

The constant on time valley current mode control and low 43ns minimum on time allow low duty cycles, suitable for high step down ratios and an extremely fast transient response.
Both parts feature an input voltage range from 4 to 38V. The on board N-channel MOSFET driver allows the use of high power external MOSFETs to produce output currents up to 20A.
The LTC3878 has an output voltage range of 0.8V to 90% of VIN, whereas the LTC3879 has an output range of 0.6V to 90% of VIN. Both parts are designed to be stable with all ceramic output capacitor designs for space constrained applications. The operating frequency is programmed with an external resistor and allows for up to 1MHz switching. No sense resistor is required, and the output current is measured by sensing the voltage drop across the synchronous MOSFET.

Chris Shaw

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